ACS Gen Chem 2 Final Exam Study Guide
2026 | Complete Questions and Guide
Answers, 100% Verified Graded A+
EXAM OVERVIEW
Exam: ACS General Chemistry 2 Final Exam
Format: ~70 multiple-choice questions, 110 minutes
Topics Covered: Intermolecular forces, solutions and colligative properties,
chemical kinetics, chemical equilibrium, acids and bases, solubility equilibria,
thermodynamics, electrochemistry, and nuclear chemistry
SECTION 1: INTERMOLECULAR FORCES & SOLUTIONS
Question 1
Where is the hydrophilic (attracted to water) region of the molecule?
A) Region 1
B) Region 2
C) Region 3
D) The three regions are equally hydrophilic
Correct Answer: C
,Rationale: The hydrophilic region of a molecule is the polar part that is attracted to
water. This region typically contains polar bonds or functional groups capable of
hydrogen bonding with water molecules.
Question 2
Which molecule is most soluble in water?
A) A nonpolar molecule
B) A molecule with only London dispersion forces
C) A polar molecule capable of hydrogen bonding
D) A large hydrocarbon
Correct Answer: C
Rationale: "Like dissolves like." Polar molecules and those capable of hydrogen
bonding are most soluble in water, which is a polar solvent. Molecules with
hydrogen bonding groups (OH, NH) dissolve readily.
Question 3
A solution of NaCl in water has a concentration of 20.5% by mass. What is the
molal concentration of the solution? Molar mass NaCl = 58.44 g/mol
A) 0.205 m
B) 0.258 m
C) 3.51 m
D) 4.41 m
Correct Answer: D
,Rationale: Molality = moles of solute / kg of solvent. In 100 g of solution, 20.5 g
NaCl and 79.5 g water. Moles NaCl = 20..44 = 0.351 mol. kg water = 0.0795
kg. Molality = 0..0795 = 4.41 m.
Question 4
What is the mole fraction of water in 200 g of 89% (by mass) ethanol, C₂H₅OH?
Molar mass C₂H₅OH = 46 g/mol
A) 0.11
B) 0.24
C) 0.32
D) 0.76
Correct Answer: B
Rationale: In 200 g solution, 178 g ethanol and 22 g water. Moles ethanol = 178/46
= 3.87 mol. Moles water = 22/18 = 1.22 mol. X_water = 1.22 / (1.22 + 3.87) = 0.24.
Question 5
A mixture of 100 g of K₂Cr₂O₇ and 200 g of water is stirred at 60°C until no more of
the salt dissolves. The resulting solution is poured off into a separate beaker,
leaving the undissolved solid behind. The solution is now cooled to 20°C. What
mass of K₂Cr₂O₇ crystallizes from the solution during the cooling?
A) 9 g
B) 18 g
C) 31 g
D) 62 g
, Correct Answer: D
Rationale: Based on solubility curves, the difference in solubility between 60°C and
20°C determines the mass that crystallizes.
Question 6
Carbonated beverages have a fizz because of gas dissolved in the solution. What
increases the concentration of gas in a solution?
A) Cooling the solution
B) Heating the solution
C) Increasing the volume of solution
D) Decreasing the volume of solution
Correct Answer: A
Rationale: Henry's Law states that gas solubility increases with decreasing
temperature and increasing pressure. Cooling the solution increases gas solubility.
Question 7
When 100 g of an unknown compound was dissolved in 1.00 kg of water, the
freezing point was lowered by 6.36°C. What is the identity of this unknown
compound? Kf for water = 1.86°C/m
A) CsCl
B) KCl
C) LiF
D) NaCl
2026 | Complete Questions and Guide
Answers, 100% Verified Graded A+
EXAM OVERVIEW
Exam: ACS General Chemistry 2 Final Exam
Format: ~70 multiple-choice questions, 110 minutes
Topics Covered: Intermolecular forces, solutions and colligative properties,
chemical kinetics, chemical equilibrium, acids and bases, solubility equilibria,
thermodynamics, electrochemistry, and nuclear chemistry
SECTION 1: INTERMOLECULAR FORCES & SOLUTIONS
Question 1
Where is the hydrophilic (attracted to water) region of the molecule?
A) Region 1
B) Region 2
C) Region 3
D) The three regions are equally hydrophilic
Correct Answer: C
,Rationale: The hydrophilic region of a molecule is the polar part that is attracted to
water. This region typically contains polar bonds or functional groups capable of
hydrogen bonding with water molecules.
Question 2
Which molecule is most soluble in water?
A) A nonpolar molecule
B) A molecule with only London dispersion forces
C) A polar molecule capable of hydrogen bonding
D) A large hydrocarbon
Correct Answer: C
Rationale: "Like dissolves like." Polar molecules and those capable of hydrogen
bonding are most soluble in water, which is a polar solvent. Molecules with
hydrogen bonding groups (OH, NH) dissolve readily.
Question 3
A solution of NaCl in water has a concentration of 20.5% by mass. What is the
molal concentration of the solution? Molar mass NaCl = 58.44 g/mol
A) 0.205 m
B) 0.258 m
C) 3.51 m
D) 4.41 m
Correct Answer: D
,Rationale: Molality = moles of solute / kg of solvent. In 100 g of solution, 20.5 g
NaCl and 79.5 g water. Moles NaCl = 20..44 = 0.351 mol. kg water = 0.0795
kg. Molality = 0..0795 = 4.41 m.
Question 4
What is the mole fraction of water in 200 g of 89% (by mass) ethanol, C₂H₅OH?
Molar mass C₂H₅OH = 46 g/mol
A) 0.11
B) 0.24
C) 0.32
D) 0.76
Correct Answer: B
Rationale: In 200 g solution, 178 g ethanol and 22 g water. Moles ethanol = 178/46
= 3.87 mol. Moles water = 22/18 = 1.22 mol. X_water = 1.22 / (1.22 + 3.87) = 0.24.
Question 5
A mixture of 100 g of K₂Cr₂O₇ and 200 g of water is stirred at 60°C until no more of
the salt dissolves. The resulting solution is poured off into a separate beaker,
leaving the undissolved solid behind. The solution is now cooled to 20°C. What
mass of K₂Cr₂O₇ crystallizes from the solution during the cooling?
A) 9 g
B) 18 g
C) 31 g
D) 62 g
, Correct Answer: D
Rationale: Based on solubility curves, the difference in solubility between 60°C and
20°C determines the mass that crystallizes.
Question 6
Carbonated beverages have a fizz because of gas dissolved in the solution. What
increases the concentration of gas in a solution?
A) Cooling the solution
B) Heating the solution
C) Increasing the volume of solution
D) Decreasing the volume of solution
Correct Answer: A
Rationale: Henry's Law states that gas solubility increases with decreasing
temperature and increasing pressure. Cooling the solution increases gas solubility.
Question 7
When 100 g of an unknown compound was dissolved in 1.00 kg of water, the
freezing point was lowered by 6.36°C. What is the identity of this unknown
compound? Kf for water = 1.86°C/m
A) CsCl
B) KCl
C) LiF
D) NaCl
